User's Manual

®
6 Vermeer
®
DigiTrak
®
L
T
™
Operator’s Manual
Safety Precautions
and Warnings (Continued)
¾ Prior to the start of each drilling run, test the LT system with the transmitter inside the drill head to
confirm that it is operating properly and check that it is providing accurate drill head location and
heading information (see Receiver section) and accurate drill head depth, pitch, and roll information.
¾ During drilling, the depth will not be accurate unless:
• The receiver has been properly calibrated and the calibration has been checked for accuracy so
that the receiver shows the correct depth.
• The drill head has been located correctly and accurately and the receiver is directly above the
transmitter in the tool underground.
• The receiver is kept level.
¾ Always test calibration after you have stopped drilling for any length of time.
¾ Interference can cause inaccuracies in the measurement of depth and the loss of the transmitter
pitch, roll, or heading. You should always perform an electrical interference check prior to drilling.
• Sources of interference include but are not limited to traffic signal loops, invisible dog fences,
cable TV, power lines, fiber-trace lines, metal structures, cathodic protection, telephone lines, cell
phones, transmission towers, conductive earth, salt water, rebar, radio frequencies, and other un-
known sources of interference.
• Interference with the operation of the remote display may also occur from other sources operating
nearby on the same frequency, such as car rental agencies using their remote check-in modules,
other directional drilling locating equipment, etc.
¾ Background noise must be minimal and signal strength must be at least 150 points above the back-
ground noise during all locating operations.
¾ Carefully review this manual to ensure you know how to operate the LT system properly to obtain
accurate depth, pitch, roll, and locate points. If you have any questions about the operation of the
system, please call DCI’s Customer Service Department at 425-251-0559 or 800-288-3610 between
the hours of 6:00 a.m. and 6:00 p.m. Pacific Time, Monday through Friday, and we will do our best to
assist you.
REMEMBER: If you are having difficulty on the job or if you have any questions about
the operation of the LT system, call DCI’s Customer Service Department at 425-251-
0559 or 800-288-3610 between 6 a.m. and 6 p.m. Pacific Time, Monday through Friday,
for assistance.